Influence on thermal response test by groundwater flow in vertical fractures in hard rock

S.E.A. Gehlin and G. Hellström

Renewable Energy, 2003, vol. 28, issue 14, 2221-2238

Abstract: In this paper different approaches to groundwater flow and its effect in the vicinity of a borehole ground heat exchanger are discussed. The common assumption that groundwater flow in hard rock may be modelled as a homogeneous flow in a medium with an effective porosity is confronted and models for heat transfer due to groundwater flow in fractures and fracture zones are presented especially from a thermal response test point of view. The results indicate that groundwater flow in fractures even at relatively low specific flow rates may cause significantly enhanced heat transfer, although a continuum approach with the same basic assumptions would suggest otherwise.

Keywords: Ground heat exchanger; Borehole; Groundwater; Thermal response test; Thermal conductivity (search for similar items in EconPapers)
Date: 2003
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Citations: View citations in EconPapers (29)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:28:y:2003:i:14:p:2221-2238

DOI: 10.1016/S0960-1481(03)00128-9

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